Tuesday, February 15, 2011

Here is a relatively easy way to create a quick thematic map, based on Object Data, using a table of ranges in an Alter Properties Query.

My book "Digging Into AutoCAD Map 3D" shows you how to alter the properties of AutoCAD objects when querying them into a current drawing, based on object data values.

This tutorial takes it a step further, altering properties different ways, based on ranges of data. The tutorial begins with a drawing of line segments representing streets that was imported from a GIS Shapefile. An object data table was created during the import to contain the attribute data, which includes the speed limit of each street segment. From this, you'll learn how to quickly create a simple thematic map, with color-coded streets based on where the speed limits fall within two ranges: those 35 MPH and under, and those over 35 MPH.

The technique can be used with a wide variety of data, and applied to many common work-flow scenarios.

Thursday, December 9, 2010

More and more often, we encounter project data that was created with ESRI products and stored in a Geodatabase file. Autodesk has added the capability to directly access these files through FDO, from within Map 3D and Civil 3D.

Monday, November 15, 2010

In our book “Digging Into AutoCAD Map 3D 2011 – Level 1 Training” we cover the basics of Object Data and External Database Links. We explain the differences between these two methods of linking data to AutoCAD objects, and what types of data are appropriate for each.

At some point, you might wish to do a little more with the Object Data than you can from within AutoCAD Map 3D. One very quick and easy way to do this is by EXPORTING the data to a Shapfile, and then opening the accompanying DBF file with a database program like Access, or with a spreadsheet program like Excel. From there, you can use Access or Excel tools to sort and display the object data in various ways, perform counts and math on values, etc.

Monday, October 18, 2010

This is a color-coded topographic map of the far side of the moon. Since the Moon has no air or water, and hence no "sea level", zero altitude is set at the Moon's mean (average) radius, of just over a thousand miles. Altitudes below that use bluer tones, suggestive of oceanic regions on the Earth, and altitudes above that green and redder tones, suggestive of land regions on the Earth (areas shown in gray have no reliable altitude data). As the result, the lunar maria, once thought to be oceans, are shown as though they were oceans, while the lunar terrae, once thought to be highlands, are shown as though they were continents.

Tuesday, September 28, 2010

I recently received a 100 MB raster image file from a client, and needed to use it as a background image in a bathymetric map of a reservoir. The image was a very high resolution TIFF file, depicting the bottom of the reservoir in great detail, which the client needed to see in his maps. It looked great in model space, on the layout tab, and even showed up in a plot preview, but when I tried to plot it to a PDF, the image was absent from the final plot.

Obviously, when plotting a lot of software and hardware variables come into play. I found a couple of solutions that helped in my situations; perhaps they will help you in similar situations.

Tuesday, September 21, 2010

Everyone who knows me knows that I am a map nerd. I surround myself with maps, even on everyday objects. The coffee cup I've used for over 23 years sports a map of the London Underground, and my favorite shirt features coastline patterns from nautical maps.

I thought I would list a few other sources for maps on clothing, starting with my friend Autumn's TopoTees; skillfully printed T-shirts featuring images of some of the lakes in the Adirondacks from vintage USGS quadrangles. If you order one, please tell them: "Russell sent me!"

There are many different sources for maps on clothing. You can also get maps on shoes, jackets, even boxer shorts, but the TopoTees are more my style...

About Me

An independent consultant since 1994, I have worked with geospatial data and cartographic design tools since 1985, on several different platforms for a diverse base of commercial, civic and academic clients. I teach AutoCAD and Map 3D in classrooms, at events such as Autodesk University, and as a tutor -- one-on-one.
I am the technical editor of all of Cadapult Software Solutions' training books, and a co-author of "Digging into AutoCAD Map 3D 2011" (plus earlier editions appropriate for Map 3D releases back to 2004).